import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

x, y, k, p = mi()
rem = x + y - 1
x -= 1
y -= 1

if x - (rem // 2) > 0 and y - (rem // 2) > 0:
    if rem % 2:
        print('Bob')
    else:
        print('Alice')
else:
    if x - (rem // 2) == 0:
        if (-1) ** (y + 1) == p:
            print('Alice')
        else:
            print('Bob')
    else:
        if (-1) ** (k - x - 1) == p:
            print('Alice')
        else:
            print('Bob')